I think if you're extra careful when driving, you can get away with 19"s, they'll look great on your car. You won't rub if you run the standard fitment, i.e. 235-35-19 on 8.5Jx19 front & 265-35-19 on 9.5Jx19 rear. Silver CSLs are classic & would look good on your Montego E90.